JELE_V2_N3_RP3 Suryakalavathi K. Mahendran B. Indhumathy Journal on Electronics Engineering 2249 – 0760 2 3 16 21 Multilevel Inverter, Selective Harmonic Elimination (SHE), Hybrid GA/PSO Optimization (HGAPSO), Total Harmonic Distortion (THD) This paper presents Hybrid GA/PSO optimization (HGAPSO) technique applied to determine the switching angles of a cascaded multilevel inverter. This technique eliminates specified higher order harmonics while maintaining the required fundamental voltage. This technique can be applied to multilevel inverters with any number of levels. As an example, in this paper an eleven-level inverter is considered and the optimum switching angles are calculated offline to eliminate the 5th, 7th, 11th and 13th order harmonics. The simulation is carried out in MATLAB/Simulink package. Results show that the proposed method does effectively eliminate a great number of specific harmonics and the output voltage is resulted in low total harmonic distortion (THD). March – May 2012 Copyright © 2012 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1765